Dunno the whole story, so you may have tried it.
But to answer your Q: if you actually developed and own the brand and formula, i would have found another, smaller, custom formulator who actually wanted your business. There are a fair number of them out there. My guess is that your product chemistry is "special" because it was formulated for a very specific purpose. But i doubt that the chemistry is special in terms of industrial process. IOW, almost any formulator, or college chem lab could reverse engineer it. from a small sample.
OTOH, how many gallons of pool table cloth adhesive (all brands) is sold in a year?